Select from following answers:- config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));

- config.Formatters.XMLFormatter.SupportedMediaTypes.Add (new MediaTypeHeaderValue("text/html") );
- config.Formatters.JsonFormatter.SupportedMediaTypes.Add (new MediaTypeHeaderValue("text/xml") );
- config.Formatters.XMLFormatter.SupportedMediaTypes.Add (new MediaTypeHeaderValue("text/xml") );
- All Above
In the in WebApiConfig.cs class in MVC Web API project we need to add
config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
To ensure that the data return only JSON. Asp.net web API will serialize the returning object to JSON and as the application/json is added in the header so the browser will understand that the WebAPI is returning only JSON result.
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